Nearly 5,000 people have died from the virus, the vast majority of them in Sierra Leone, Liberia and Guinea.

In other developments:

Eighty-two people who had contact with a toddler who died in Mali are now being monitored

A Dallas nurse who contracted Ebola in the US from a Liberian patient but is now free of the virus has been discharged from hospital

New US federal guidelines say medics returning from treating Ebola patients in West Africa should be monitored but not placed in quarantine - but some states say they will continue with their quarantine polices

President Barack Obama has said policy for returning medics should be based on science and not fear - he said it was important not to discourage US frontline workers from fighting Ebola

Separately, the US Army has imposed a 21-day monitoring period for all soldiers returning from the region

'Protect Australians'

The Australian government announced on Monday that it was cancelling non-permanent or temporary visas held by people from the affected countries who were not yet travelling, and that new visa applications would not be processed.

Permanent visa holders yet to arrive in Australia must undergo a 21-day quarantine process before departure.

Immigration Minister Scott Morrison told parliament: "The government's systems and processes are working to protect Australians."

But Sierra Leone's Information Minister Alpha Kanu described the move as "too draconian", insisting that measures put in place at Sierra Leone's Freetown airport had successfully prevented anyone flying out of the country with Ebola.

"It is discriminatory in that... it is not [going] after Ebola but rather it is... [going] against the 24 million citizens of Sierra Leone, Liberia and Guinea. Certainly, it is not the right way to go," he told Reuters news agency. "This measure by the Australian government is absolutely counterproductive."

Image copyrightGetty ImagesImage caption
World Bank President Jim Yong Kim made an emotional appeal for help

Image copyrightEPAImage caption
Health workers arrive to pick up the body of a young victim in Freetown, Sierra Leone

Ugandan government spokesman Ofwono Opondo said: "Western countries are creating mass panic which is unhelpful in containing a contagious disease like Ebola.

"If they create mass panic... this fear will eventually spread beyond ordinary people to health workers or people who transport the sick and then what will happen? Entire populations will be wiped out."

Amnesty International said Australia was taking a "narrow approach".

A spokesman for the human rights group said the ban made no sense from a health perspective but ensured that vulnerable people were trapped in a crisis area.

'Fear factor'

Meanwhile, the president of the World Bank has appealed for thousands of medical workers to volunteer and help contain the growing Ebola outbreak in West Africa.

Jim Yong Kim said at least 5,000 medics and support staff were needed to beat the disease.

Many potential recruits were too scared to travel to West Africa, he added.

Mr Kim was speaking during a visit to Ethiopia, where he accompanied the UN secretary general and African Union chairwoman Nkosazana Dlamini-Zuma.

"Right now, I'm very much worried about where we will find those healthcare workers," he said.

"With the fear factor going out of control in so many places, I hope healthcare professionals will understand that when they took their oath to become a healthcare worker it was precisely for moments like this," he added.

Mr Ban said that transmission rates in West Africa continued to outstrip the pace of the international response.